JPS6337327A - Exposure control device for camera - Google Patents

Abstract

PURPOSE:To obtain an exposure control device of a camera, which can eliminate meaninglessly setting an auto bracket mode, by providing a valve mode priority means for inhibiting the setting of the auto bracket mode by an auto bracket mode setting means, when a valve mode is set. CONSTITUTION:Whether a valve mode is set by a valve mode setting means or not is discriminated. In such a case, when the valve mode is set, a valve mode priority means 103 inhibits setting of an auto bracket mode by an operation of an auto bracket mode setting means 101, and when the valve mode is not set, the means 103 accepts setting of the auto bracket mode by an operation of the auto bracket mode setting means 101. An auto bracket photographing control means 104 executes plural times photographing which has varied automatically an exposure value, namely, auto bracket photographing, when the auto bracket mode is accepted by the valve mode priority means 103.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to an improvement in an exposure control device for a camera equipped with an auto-bracketing control means for performing continuous shooting while automatically changing the exposure value. be.

Note that the auto bracketing (more precisely called auto exposure bracketing) refers to the camera's exposure value (in the case of automatic exposure, the exposure control value is automatically calculated from the subject brightness and film sensitivity, and in the case of manual exposure, This refers to the offset of the camera with respect to the shutter speed and aperture value set by the photographer.Simply put, when photographing a certain subject, multiple photos are taken by changing the exposure value in several stages. This means that the camera automatically takes pictures.

(Background of the Invention M) In a camera that can independently set the bulb mode and auto bracket mode, it is possible to take pictures with both modes set. However, in bulb photography, the difference in exposure level is determined by when the photographer presses and releases the release button, so auto-bracket photography in bulb mode is essentially meaningless.

Therefore, if photography is made possible using both mode settings unnecessarily, there is a risk that the photographer will misunderstand and perform incorrect operations.

(Object of the Invention) An object of the present invention is to provide an exposure control device for a camera that can solve the above-mentioned problems and eliminate meaningless settings of auto bracketing mode.

(Features of the Invention) In order to achieve the above object, the present invention includes a valve mode priority means for prohibiting the auto bracketing mode setting by the auto bracketing mode setting means when the valve mode is set. When in valve mode,
A feature of the camera is that auto-bracket photography is not possible.

(Embodiment of the Invention) FIG. 1 shows the basic configuration of an embodiment of the invention, and FIG. 2 shows its flowchart.

First, it is determined whether or not the first stroke of the release button has been operated. If the first stroke has not been operated, the auto bracketing mode can be set by operating the auto bracketing mode setting means 101. Next, it is determined whether or not the valve mode is set by the pulp mode setting means 102. If the pulp mode is set here, the valve mode priority means 103 is set to the auto bracket mode setting means 10.
Prohibits auto bracketing mode setting by operation 1.
If the pulp mode is not set, the auto-bracketing mode setting by operating the auto-bracketing mode setting means 1O1 is accepted.

When the auto bracketing mode is accepted by the bulb mode priority means 103, the auto bracketing shooting control means 104 automatically performs shooting with the exposure value changed a plurality of times, that is, auto bracketing shooting i-shadow. .

FIG. 4 shows the arrangement of each operating member when looking from the front of the camera incorporating the device embodying the embodiment shown in FIG. 1, and FIG. 5 shows the arrangement of each operating member when looking from above. Figure 6 shows the arrangement of each operating member when viewed from the back side.
In Figures 6 to 6, l is the release button, 2 is the operating lever for selecting the shooting mode of rapid shooting (C) or single shooting (S), 3 is the operating lever for selecting the self-timer, and 4 is the shutter. The exposure mode selection knob selects the exposure mode of priority (Tv), aperture priority (Ay), or manual (M). For example, the so-called electronic dial is equipped with a 2-bit conductive pattern and a brush that have a phase difference of 90 degrees, and is used to set the information for every 5 steps or 1 step. swM is the aperture value setting. The aperture value can be changed by pressing the switch swM and operating the dial 5 in the manual exposure mode. Reference numeral 6 designates a switch lid of a storage section 7 that stores switches that are used less frequently, swABR represents an auto-bracketing switch that is stored in the storage section 7, and swME represents a multiplex shooting switch that is also stored in the storage section 7. It is.

FIG. 3 shows a specific example of an electric circuit in which a microcomputer COM is used to control a series of operations.

The light-receiving element SPC receives reflected light from the subject and outputs a light-receiving signal to a high input impedance operational amplifier OPi whose feedback circuit is connected to a compression diode Di. The operational amplifier OPl outputs the logarithmically compressed object luminance information By via the resistor R1. A variable resistor VR1 connected to the constant voltage source Gl outputs film sensitivity information Sv. An operational amplifier OP2 whose feedback circuit is connected to a resistor R2 calculates and outputs photometric information Ev=(By+Sv). l
Im optical information Ev is converted into a 4-bit digital value by an A/DD 7 converter ADC, and is input to a manual boat PGO-PG3 of the microcomputer COM.

When the dial 5 is operated, a number corresponding to the number of clicks is counted by the dial interface circuit DIF, and the value is converted into 4-bit information and input to the input ports PHO to PG3 of the microcomputer COM. . The information in the dial interface circuit DIF is such that the pulse signal is sent to the output port P of the microcomputer COM.
It is reset by input from E3. 2i depending on which mode is selected by the exposure mode selection knob 4! The exposure mode switch 5w5EL of I is turned on and off, and 2-bit information corresponding to the selected exposure mode is sent to the input ports PPO to PP of the microcomputer COM.
input to I.

When the battery BAT is loaded into the camera, the microcomputer COM and display system decoder TD are activated.

AD, FD and dial interface circuit DI
A power supply Vbat is supplied to F and the like. Also, the release button l
When the first stroke switch SW1 connected to the capo PAO is turned on by the first stroke of The voltage from Vbat is supplied as a power supply Vcc to the photometric operational amplifiers OPI and OP2, which consume power in an equal proportion and equal gravity.

Microcomputer COM input capo) PAl~11
The second stroke switch SW2 is turned on by the second stroke of the release button L, and turned off by raising the mirror.
Mirror up switch swM that turns on when the mirror is down
RUP, fi Charging completion detection switch sw CG E, film switch swFLM, which turns on when the internal charging is completed, film switch swFLM, which turns on every time the feeding of one frame of film is completed, trailing curtain, which turns on when the trailing curtain has completed running. Switch 5wCN2, a self-display switch 5 that is turned on when the self-timer is set by the operating lever 3;
w5ELF, a switch 5wC5 that is turned on when the quick shooting mode is selected by the operation lever 5, and turned off when the single shooting mode is selected, the aperture value setting switch swM, and when the switch lid 6 is closed. Switch 5w5E turns off and turns on when opened
T, the multiplex photographing switch swME, and the auto-bracketing switch SwABR are connected to each other.

The bases of transistors TR0-TR2 are connected to the output ports PE0-PE2 via resistors RIO-12, and the transistors TRO-TR2 are connected to the first clamping magnet MG.
It controls the energization of the leading curtain magnet MGl that drives the O1 leading curtain and the trailing curtain magnet MG2 that runs the trailing curtain. Also, resistor R13 is installed on the output boats FD, PC, and PH.
The bases of transistors TR3 to TR5 are connected through transistors TR3 to TR5, transistor TR3 drives charging motor MD, transistor TR4 drives rewinding motor MC, and transistor TR5 winds the film at high speed. The respective drives of the winding motors MD are controlled.

From the output port PTD, the contents of the shutter time information register RGTv in the microcomputer 00M are output to the decoder TD, and the decoder TD converts the contents into a signal for displaying the shirt time and time, and the decoder TD converts the contents into a signal for displaying the shirt time and time. The signal is output to the displayed display 5EG1.

Output ports PFL and PABR output a signal of "l°' (meaning high level) or 0'' (meaning low level) to decoder AD, and decoder AD outputs a signal of "lo" from output port PFL. is input, a signal for displaying a bracket mark point reduction is output to the connected display device 5EG2, which is composed of a liquid crystal, etc. If a signal of t'' is input from the output port PABR, the display 5EG2 outputs a signal for displaying the bracket mark.

Output capo) The PME outputs an "l" or "O" signal to the display 5EG4 composed of a liquid crystal, etc.
When the signal 1'' is input to the EG4, a multiple shooting mark is displayed.

From the output port PFD, the microcomputer 00M
The contents of the aperture value information register RGAv, the contents of the auto bracketing step information register RGBH, or the contents of the multiple sheet and number information register RGME are stored in the decoder FD.
Output to. The decoder FD outputs a signal for numerical display corresponding to each of the above-mentioned contents to a connected display device 5EG5 composed of a liquid crystal or the like.

The contents of the aperture value information register RGAv in the microcomputer 00M are output from the output port PAV to the aperture control drive circuit DAV. The aperture control drive circuit DAY is connected to the drive actuator CAW.
For example, the information converted into actual aperture information is output to a stepping motor or the like, and this is driven to perform appropriate aperture control.

Next, the operation of the microcomputer COM will be explained with reference to flowcharts shown in FIGS. 7-9.

When the battery BAT is loaded into the camera and the power supply Vbat is generated, the microcomputer COM starts the operation from the start of the flowchart shown in FIG.

[Step l] Suppose that the photographer only makes the first stroke of the release button l, and the first stroke switch s
When the wl ON signal is input to the input PAO, the process proceeds to step 2.

[Step 2] Output the “L” signal from the output port PF, turn on the transistor TRbat, and turn on the '1i source v.
CC is supplied to each section. Then, the photometry timer is started. The photometry timer is the first stroke switch swl.
This is to keep the power supply Vcc continuously supplied for a predetermined period of time after the off signal is input.This allows the photographer to check the photometry status for a predetermined period of time even if the photographer releases the release button L.
The key is to use the exposure mode selection knob 4 to change the setting information while viewing the display. Note that this configuration can be easily performed using a hardware timer built into the microcomputer COM.

[Step 3] The photometric information Ev converted into a 4-bit digital value by the A/D converter ADC is stored in the internal register RGEv.

[Step 4] It is determined whether the shutter priority mode is set based on the input states of the input ports PPO and PP1. If the shutter priority mode is currently set, the process advances to step 5.

[Step 5] Subtract the contents of the shutter information register RGTv, which stores the information set by operating the dial 5, from the contents of the register RGEv, and store the result (aperture information Ay) in the aperture information register RGAv. let It is assumed that the contents of all registers in the microcomputer 700M are held while the battery BAT is loaded. Also, if you load the battery BAT for the first time,
It is assumed that a frequently used value, for example, information such as 1/125 seconds is initially set.

[Step 6] The contents of the register RGBH that stores the auto bracketing exposure step number information are stored in the aperture bracketing step number register RGBA. Also, the contents of the shutter bracket stage number register RGBT are set to zero (0).

[Step 7] Determine the state of flag FABR indicating whether auto bracketing mode is set. Assuming that auto bracketing mode is not currently set,
Proceed to step 8.

[Step 8] Determine the state of flag FMH indicating whether multiple shooting mode is set.

Imada i1! Assuming JM Aya mode is not set,
Proceed to step 9.

[Stay 7 9] Auto bracket switch 5WAB
A flag FsAB indicating whether R has been operated is reset to 0. Also, a flag FsME indicating whether the multiplex photographing switch swME has been operated is reset to 0.

[Step 10] The contents of the aperture information register RGAv are output from the output register PFD, and the contents of the shutter information register RGTv are output from the output register PTD. As a result, the aperture value calculated by the calculation is displayed on the display 5EG5, and the set shutter speed time is displayed on the display SEG1.

[Step 11] The second stroke of the release button l is performed, and it is determined whether the on signal of the second stroke switch sw2 is input to the input boat PAL.
Assuming that the on signal of the younger 2-stroke switch SW2 is not input, the process returns to the start. Further, while the ON signal of the first stroke switch swl is manually input, calculation information can be obtained from the subject brightness information, film sensitivity information, and setting information by this routine, and these information can be displayed.

Further, if the aperture priority mode is set, the process proceeds from step 4 to step 12 to step 13.

[Step 13] The contents of the register RGAv, which stores the information set by the operation of the dial 5 and the aperture value setting switch swM, are subtracted from the contents of the register RGEv, and the result is added to the shutter information register RGTv.
to be memorized.

Note that when the battery BAT is loaded for the first time, a frequently used value 1, for example, F5.6, is initially set.

[Step 14] The contents of the bracket stage number register RGBH, which stores the exposure stage number information of auto bracketing, are stored in the shutter bracket stage number register RGBT. Also, the contents of the register RGBA for the number of aperture rebracketing stages are set to zero.

Thereafter, in the aperture priority mode, the same sequence as in the shutter priority mode is performed, and the aperture value set in step 10 is displayed on the display 5EG5, and the shutter speed calculated by the calculation is displayed on the display 5EG1. Is displayed.

If the manual exposure mode is set, the process goes from step 4 to step 12 to step 15.

[Step 2 15] Register RGT that stores the shutter speed information set by operating the dial 5
The contents of M are stored in the shutter information register RGTv. This is because when auto bracket shooting is set in manual exposure mode, the contents of register RGTv change every time you shoot.

This is to store the information set by operating the dial 5 as is, and the details will be described later.

After that, the same sequence as in the aperture priority mode is followed, and the aperture value set in step IO is displayed.
The shirt time set in EG5 is displayed on display 5EGI.

Next, information setting by dial operation while the 1111 optical timer is operating will be described. When the depression (first stroke) of the release button 1 is stopped during the above-described sequence, an off signal of the first stroke switch swl is input, and the program proceeds from step 1 to step 20.

[Step 203: Determine whether or not the switch lid 6 has been opened based on the state of the switch 5w5ET. Assuming that switch A6 remains closed, the input capo) PA
Since the off signal of switch 5w5ET is input manually at 9,
Proceed to step 21.

[Step 211111 Determine whether or not the optical timer is in operation. Since this is just after the photometry timer has been activated in step 2, the process advances to step 22.

[Step 22] It is determined whether the shutter priority mode is set based on the input states of the manual boats PPO and PP1. If the shutter priority mode is currently set, the process proceeds to step 23.

[Step 231 Here, an information reading routine associated with the operation of the dial 5 is executed. Here, the information reading routine accompanying the dial operation will be explained with reference to FIG.

r Information Reading Routine 1 [Step 801 The information input to the input ports PHO to PH3 is stored in the dial register RGH. At this time, the register RGH stores a number 1 corresponding to the number of clicks on the dial 5 and information as to whether the number is positive or negative depending on the direction of rotation of the dial 5. That is, 4-bit information indicating how many steps to shift up or down from the current information is stored.

[Step 811 Output] Output the pulse signal of PE3. As a result, the value of the dial interface circuit DIF is reset to O.

[Step 821 Return to the original step.

Returning again to the flowchart in FIG.

[Step 24] The numerical value set by the dial operation (the contents of register RGH) and the shutter information m (the contents of register R
(contents of GTv) and stored in the shutter information register RGTv again.

Also, the contents of the shutter information register RG T v are stored in the register RGTM.

[Step 25] It is determined whether or not a certain code indicating the valve mode located next to the longest second of the shutter speed is stored in the register RGTM.If it is not currently the valve mode, go to NEXTl, that is, step 3
Hejyump.

In this way, during the photometry timer after the press of the release button L (first stroke) is stopped, the setting information can be changed by operating the dial 5, and then the routine from step 3 described above is executed. In step 10, the aperture value and shutter speed are displayed on the display 5EGI.
5EG5, respectively.

Further, if the aperture priority mode is set, the process proceeds to step 22 -> step 26 -> step 27.

[Step 27] Similar to step 23, here, an information reading routine associated with the operation of the dial 5 is executed.

[Step 28] The numerical value set by dial operation (contents of register RGH) and aperture value information (contents of register RG
Av contents) and register R for 11 degree aperture information.
Store it in GAv. Also, in aperture priority mode, NE
The aperture value and shutter speed can be displayed on the displays 5EGI and 5EG5 in step 10, as in the case of the shutter speed priority mode.

If the manual exposure mode is set, the process proceeds from step 22 to step 26 to step 29.

[Step 29] Determine the on/off state of the aperture value setting switch swM. In the manual exposure mode, operate the aperture value setting switch swM and operate the dial to set the aperture value, and only by dialing the shirt button. Since the configuration is such that the seconds and hours can be changed, when the switch swM is on, the process proceeds to the same routine (step 27) as in the aperture priority mode, and when it is off, the shutter priority mode is executed. The program then proceeds to execute the same routine (step 23).

When a predetermined period of time has elapsed after the pressing operation of the release button 1 was stopped, the photometry timer operation ends.

Along with this, the program moves from step 21 to step 3.
Proceed to 0.

[Step 30] Output ports PTD, PFL.

The outputs of PABR, PME, and PFD are set to "0", and all the displays on the displays 5EGI-5EG5 (however, the display 5EG2 is not present) are turned off. Further, the output of the output port PF is set to "0", the transistor TRbat is turned off, and the supply of the power supply Vcc is stopped.

[Step 31] As in Step 9, both the flag FsAB indicating whether the auto bracketing switch swABR has been operated and the flag FsME indicating whether the multiple shooting switch swME has been operated are reset to 0.

The program then jumps to start.

Therefore, after the photometry timer ends, step 1→step 2
The standby mode of 0→Step 21→Step 30→Step 31 is repeated.

Next, a description will be given of the time when the auto bracketing mode is set. First, a case will be described in which only the opening operation of the switch cover 6 is performed to set the auto bracketing mode. When the switch cover 6 is opened, the switch 5w5
ET is turned on, and this on signal is input to the human-powered boat PA9. The program then proceeds from step 20 to step 40.

[Step 40] Auto bracket switch SwAB
Since the switch cover 6 has just been opened and the auto bracket switch 5WABR has not been operated, the process proceeds to step 41.

[Step 41] The multiplex photography switch swME is determined. Similarly, since the multiplex photography switch swME has not been operated, the process advances to step 42.

[Step 42] Multiplex shooting suite 2 s w M E
In the initial state of loading the battery BAT and the ON state of the first stroke switch swl, in which the flag FsME indicating whether or not the suppression operation has been performed is determined, the flag FsME is reset to 0 in step 9, so in step 43 Proceed to.

[Step 43] Auto bracket switch SwAB
As in the case of step 42, in which flag FsAB indicating whether or not the R pressing operation has been performed, flag FsME has been reset to 0 in step 9, so the process jumps to step 21.

If the switch cover 6 is opened in this way and only the ON signal of the switch 5WSET is input, nothing is executed.

Next, from the above state, auto bracket switch swAB
A case will be described in which the pressing operation of R is performed once. When the auto bracketing switch s w A BR is suppressed, an on signal is sent to the input boat PAII.
is input. The program then proceeds from step 40 to step 44.

[Stay, P44] It is determined whether the contents of the register RGTM are in the pulp mode or not. If it is in the valve mode, the process returns to the start and does not enter the auto bracket mode.

If the valve mode is not set, proceed to step 2 45.

[Stay 2b 451 Auto plug-2 toswift Sw
A flag FsAB indicating that the ABR is turned on is set to 1, and a flag FsME indicating that the multiplex photography switch SWME is on is reset to 0.

C step 46] Output boats PTD, PFL.

Set the outputs of PABR, PME, and PFD to "0" and turn off all the displays on display 5EGI N5EG5. Next, set only the output of output boat PABR to "l" and turn off display 5
Turn on the EG3 auto bracket mark. This allows the photographer to clearly know that the auto bracketing mode has been set.

[Step 47] Set a flag FABRt-1 indicating that auto bracketing mode has been set.

[Step 48] Similar to step 23 or step 27, an information reading routine associated with the operation of the dial 5 is executed. In this case, in step 80, for example, if the stage number information of 0.5 is set by the dial 5, the stage number is r-0,5,0°0.5'', and if l is set, r Three preset auto-bracket photographs will be performed in which the exposure is automatically changed in steps of -1, 0, and IJ. Furthermore, the above-mentioned r-Q.

Shooting with the number of stops of 5, 0, 0, 5J means an exposure value that is -0.5 steps under the standard exposure value calculated by calculation, a standard exposure value, or 0 to the standard exposure value. This means that images are taken consecutively at three levels of exposure value: .5 levels overexposure value.

[Step 49] Bracket stage number register RGB
Add the contents of H and the contents of the dial, and register RG again.
Store it in BH. As mentioned above, the minimum resolution by clicking l on the dial 5 can be freely set in steps of 0.5 steps or in steps of 1 step. Note that if the shutter speed and aperture value are different from the resolution 1@, it is sufficient to insert a program that multiplies the contents of the register RGBH by an integer, and since this is not related to the water chamber, a detailed explanation will be omitted here. Also outputs the contents of the register RGBH from the output capo) PFD,
The display 5EG5 is made to display a numerical value indicating the number of stages, for example rO, 5J. Note that the decoder FD and display 5EG5 used at this time also serve as an aperture display.
The decoding of the aperture value is more discrete than the apex value Ay, and the decoding of the auto bracket is a value every 0.5 stops, so it is necessary to change the decoding contents.

For example, if the output from the output boat PFD is 5 B/ ), 32 types of data can be sent.
If the aperture value display is Fl, 4 to F32 in 0.5 step increments, there are 14 types in total, and the auto bracket display is 0 to 5.
If it is every 5 stages, there are 11 types in total, 30 types in total, and 31 types when blank codes are included.The decoder FD determines which information it is by adding a certain constant when sending data to the output port PFD. can,
Appropriate numerical display becomes possible.

[Step 50] A flag FMH indicating whether the multiple photography mode is set is determined. If the multiple photography mode is not set, the process returns to the start. If the mode is multiple shooting mode, the process advances to step 51.

[Step 513 Set the contents of the register RGME for the number of multiple shots to "3". This is because the number of auto bracket shots is predetermined to be three, so even if the number of times for multiple shots is set arbitrarily, it is mandatory. The program returns to the start at the 0th position in order to prevent operator errors and eliminate the risk of erroneous exposure. Furthermore, once the on signal of the switch 5WABR is input, the flag FsAB is set to 1 in step 45, so even if the swABR off signal is input, the program continues from step 40 → step 41 → step 42. → Step 2 43 → Step 4B, and the auto bracketing step number change mode can be maintained with dial 5, and the photographer can operate dial 5 with the suppression operation of switch swABR stopped. becomes.

The auto bracket stage number changing mode can be canceled by turning on the first stroke switch swl, or by closing the switch lid 6 and turning off the switch 5w5ET. In other words, when the ON signal of the first stroke switch swl is input, the program progresses in the order of step 1 → step 2 → step 3 →..., and the flag FsAB is reset to 0 in step 9, and its display is also In step 10, the display switches to normal display. Also switch 5w5ET
When the off signal is input, step 20 → step 2
In the process of the program proceeding from step 1 to step 30 to step 31, the auto bracket mark display disappears at step 30, and the step 31 flag FsAB is reset, so that the program does not proceed to the auto bracket stage number change mode again.

Next, exposure calculation in auto bracketing mode will be explained. In the case of shutter priority mode, the contents of the bracket stage number register RGBH are stored in the aperture bracket stage number register RGBA as described in step 6, and in the case of shutter priority mode and manual exposure mode, the contents of the bracket stage number register RGBH are stored in step 14.
As mentioned above, the shutter bracket stage number register RGB
To T.

I remember each one. In step 7, since the auto bracketing mode is set and the flag FABR is set to 1, the process advances to step 52.

[Step 52] Bracket stage number register RGBH
Determine whether the content of
Since multiple shots are taken, it is meaningless, so it is necessary to prohibit auto bracket shooting. Therefore, in this case, the process advances to step 53.

[Step 53] A flag FABR indicating auto bracketing mode is reset to O. Matade Capo) PABR
Set the output to “0” and turn off the auto bracket mark display.

Next, by proceeding to step 8, the exposure calculation for auto bracketing is not performed, the sharpness flag FsAB is reset to O, and a normal routine is executed.

In step 52, if the contents of the bracket stage number register RGBH are not zero, it is necessary to perform exposure calculation and display of the auto bracket mark using the stage number information, so the process proceeds to step 54.

[Step 54] Set the output of output port PABR to “t”
", and the auto bracket mark is displayed. This means that when the switch cover 6 is closed from the auto bracket mode setting state and the switch 5WSET is turned off,
This is because all the displays are turned off in step 30, so if the first stroke switch swl is turned on, it is necessary to turn it on again.

[Step 55] It is determined whether the first stroke switch SWl is turned on. If it is turned on, the process proceeds to step 56.

[Step 56] The contents of the aperture information register RGAv and the contents of the aperture bracket stage number register RGBA are added and stored in the register RGAv again. Also, the contents of the shutter information register RGTv and the contents of the shutter bracket stage number register RGBT are added, and the register RG is added again.
Store it on TV. This means that the aperture information calculated in the shutter priority mode and the shutter speed information calculated in the aperture priority mode are changed in accordance with the number of autobracket stages. In other words, if the autobracketing step number is set so as not to be a negative number at step 49, the value after the calculation at step 56 will be an exposure value on the under side of the standard exposure value. In addition, in manual exposure mode, since step 14, which is the same as in aperture priority mode, is passed, the shutter speed is changed, and the aperture value is not changed as in conventional cameras, so only exposure with a constant depth of field is used. Auto-bracketing photography is now possible.

Further, in step 55, the first stroke switch sw
If it is determined that l is off, the exposure calculation in step 56 is not performed because the photometry timer is operating.
In step 10, the standard exposure value will be displayed.

Even in this case, when taking a picture, the first stroke of the release button L is always made, so step 56 is always passed.
Therefore, there is no problem with auto bracketing photography.

In this way, in the auto plug-2 mode, if the first stroke switch swl is turned on, the exposure value with auto bracketing applied, that is, in this example, the underexposure 1 is displayed, While the metering timer is operating, the standard exposure value will be displayed. This results in
The photographer can easily recognize the exposure value of auto bracketing.

Next, a case will be described in which the valve mode is set by operating the dial 5 after the auto bracket mode is set.

Bracketing during bulb photography is basically meaningless, so it is more effective to cancel auto bracketing mode. Therefore, if it is determined in step 25 that the mode is the valve mode, the process advances to step 57.

[Step 57] Set the output of the output boat PABR to 0''
to turn off the auto bracket mark display. Also, reset the auto bracket mode flag FABR to O.

Next, a description will be given of when the multiple shooting mode is set.

In conjunction with the opening of switch Tom6, switch swM
When the ON signal of E is input manually, the process proceeds from step 41 to step 60.

[Step 60] A flag FsME indicating that the multiplex photographing switch swME is turned on is set to 1. Also, a flag FsAB indicating that the auto bracket switch swABR is turned on is reset to 0.

[Step 61] Output boats PTD, PFL.

Set the outputs of PABR, PME, and PFD to “O”.

Set the output of only the 0th output boat PME to "l" to turn off all displays, and set the shadow mode mark to display 5E.
Display it on G4.

[Step 62] Flag FME indicating multiple shooting mode
Set to II.

[Step 63] It is determined whether the mode is auto bracketing mode or not. If it is auto bracketing mode, the process proceeds to step 64.

[Step 64] Since the mode is auto bracketing, similarly to step 51, the number of multiple shots is forcibly set to three, that is, the contents of the register RGMH for the number of multiple shots are set to "
3".

If the auto bracketing mode is not set in step 63, the process advances to step 65.

[Step 65] Similar to step 48 and the like, an information reading routine associated with dial operation is executed.

[Step 66] Add the contents of the multiplexing number register RGMH and the contents of the dial register RGH, and store the result in the register RGMH again. Since the number of times of multiplexing is an integer, if the resolution of one click of the dial 5 is 0.5 steps, the contents of the dial register RGH are doubled and then added. It is also necessary to prevent the contents of the register RGH from becoming a negative number, but this is omitted here.

[Step 67] The contents of the multi-card concave register RGMH are output from the output port PFD and displayed on the display 5El-15.

The program then returns to the start. Furthermore, once the on signal of the switch SWMH is input, the flag FsME is set to 1 in step 60, so even if the off signal of the switch swME is input thereafter, the flag FsME is set to 1 in step 60.
1→Step 42→Step 63, and it is possible to maintain the multiple shooting number setting mode. To shift from auto bracketing step number change mode to multiple shooting setting mode, just turn on the switch swME once,
It is also clear from the flowchart in FIG. 7 that the reverse transition can be accomplished by turning on the switch swABR once.

Next, if the number of multiplexing is set once and then the number of multiplexing is set to zero (0), it is necessary to cancel the multiplex photography mode and turn off the multiplex photography mark. Since the flag FME is set to 1 in step 8, this program is executed by proceeding to step 68.

[Step 68] If the content of the register RGMH for the number of times of multi-hair photography is zero, the process advances to step 69.

[Step 69] Flag FME indicating multiple shooting mode
Reset to 0. Also, the output of output port PME is set to “O”.
11 and turn off the multiple shooting mark display.

If the contents of the register RGMH for the number of times of multiple photographing are not zero in step 68, the process proceeds to step 7o.

[Step 70] Set the output of output port PMH to “1”
”, and the multiple shooting mark is displayed. This is because all the displays are turned off in step 30, so that when the first stroke of the release button 1 is made again, the photographer is informed that the multiple shooting mode is in effect.

As described above, the preparation stage for photographing is completed.

Next, the sequence after the second stroke of the release button I will be described. When the second stroke of the release button 1 is performed and the on signal (release signal) of the second stroke switch sw2 is input to the input port PAl, the process proceeds from step 11 in FIG. 7 to step 100 in FIG. 9.

[Step 100] It is determined whether the auto bracketing mode is set or not based on the state of the flag FABR. If the auto bracketing mode is selected, the process proceeds to step lO1; otherwise, the process proceeds to step 102.

[Step lot] Set the output of the output port PFL to t
", and the auto bracketing mark on the display 5EG2 is displayed blinking. This allows the photographer to reliably know that auto bracketing photography has started.

[Step 102] Determine whether or not the ON signal of the self-switch 5ELF is input to the input port PA6. If the ON signal is input, the process goes to Step 103 because the photograph is taken using the self-timer. If not, the process goes to Step 103. Proceed to step 104.

[Step 103] A self-timer measures 10 seconds.

[Step 104] The contents of the aperture information register RGAy are output from the output port (PAV). As a result, the aperture control drive circuit DAV converts the contents of the register RGAv into actual aperture information, and starts aperture control via the aperture drive actuator CAV such as a stepping motor.

[Step 105] A pulse signal is output from the output capacitor (PEO), and the transistor TRO is turned on to energize the mirror-up magnet (MGO), which is the tJ-th combination magnet.

As a result, the mirror is raised by a known spring force.

[Step 106] It is determined whether an on signal of the switch swMRUP, which detects the completion of mirror up, is input to the input boat PA2. Here, this loop is repeated until the ON signal is input, that is, until the mirror is completely raised, and when it is completely raised, the process proceeds to step 107.

[Step 107] Shutter information register RGT
Since the contents of v are apex values, they are converted (expanded) into real-time data.

[Step 108] A pulse signal is output from the output port PEI, the transistor TRI is turned on, and the shutter front curtain magnet 1-MCI is energized. This results in
The shutter front curtain runs.

[Step 109] It is determined whether the contents of the register RGTM indicate the valve mode.

If the valve mode is set, the process proceeds to step 110; otherwise, the process proceeds to step lll.

[Step 1101 Second stroke switch Sw2
Since this is the valve mode, it is necessary to keep the shutter open while the on signal of the second stroke switch sw2 is input.

[Step Ill] Since it is not the valve mode, a real time count is performed using the data expanded in step 107, and the calculated shutter time is measured.

[Step 112] When the real time count ends, a pulse signal is output from the output port PE2, and the transistor TR2 is turned on to energize the shutter trailing curtain magnet MG2. This causes the shutter trailing curtain to run.

[Stay, 7'l13] It is determined whether or not the ON signal of the shutter rear curtain switch 5wCN2 is input to the input boat PA5. This loop is repeated until completion, at which point the process proceeds to step 114.

[Step 114] Set the PAY output to “O”
This returns the aperture to its open state.

[Step 2 115] Set the output of the output port PD to “l”
", turns on the transistor TR3, and rotates the charging motor MD for mirror down and shutter charging.

[Step 116] It is determined based on the state of flag FMH whether the multiple shooting mode is set. If it is the multiple shooting mode, the process proceeds to step 117; otherwise, the process proceeds to step 120.

[Step 117] Subtract 1 from the contents of the multiplexing number register RGME and store it in the register RGME again.

[Step 11B] It is determined whether the contents of the multiplexing number register RGME are zero. If the contents are zero, the process proceeds to step 119; if not, the process proceeds to step 121.

[Step 119] Since the content of the multiplexing number register RGME is 0, it means that multiplex photography has ended, so the flag FME indicating the multiple photography mode is reset to 0. Also, turn on the output of output port PME,
Multiple! ! Turn off the shadow mark display.

[Step 1203 Start a timer for film feeding. Also, set the output of output port FB to “1”,
The transistor TR5 is turned on to rotate the film feeding motor MB.

If the multiple shooting mode is continued, the contents of the multiplex number register RGMH are not zero, so the process advances from step 118 to step 121, and since step 120 is not passed, film feeding is not performed, so multiple shooting is not performed. It will be done. Furthermore, when multiple photography is completed, the contents of the register ROMH become zero, so film feeding is performed in step 120 after canceling the multiple photography mode as described above.

[Step 1211 Human Capo] Determine whether or not the ON signal of the charge completion detection switch swcGH is manually input to PA3.The ON signal is not input.
In other words, if charging is not completed, the process proceeds to step 123, and if charging is completed, the process proceeds to step 122.

[Step 122] Since charging is completed, the output of the output port PD is set to "O" and the power to the charging motor MD is cut off.

[Step 123] It is determined whether or not the on signal of the switch sFLM, which is turned on every time one film frame is fed, is input to PA4 (input capo). If the transfer is not completed, proceed to step 124, and when it is completed, proceed to step 1.
Proceed to 25.

[Step 124] Determine the state of the film feeding timer. When the film is finished, no further film feeding is possible, so the switch swFLM is never turned on, and in such a case, the timer for film feeding, which is, for example, a one-second timer, finishes counting. When the time measurement is completed, proceed to step 150, otherwise proceed to step 1
21 and repeat the above sequence (steps 121 and 123).

[Step 125] In step 123, switch swF
When it is detected that the LM off signal has been input, the output of the output boat PH is set to "0", the transistor TR5 is turned off, and the film feeding motor MB is stopped.

[Step 126] It is determined whether the auto bracketing mode is set or not based on the state of the flag FABR. If it is not the auto bracketing mode, the process proceeds to step 132; if so, the process proceeds to step 127.

[Step 127] Determine whether or not auto bracket shooting has been performed three times.As mentioned above, auto bracket shooting is shooting that is performed continuously at three levels of exposure: under, standard, and over. If the three shots have not been completed, the process advances to step 128.

[Step 128] The contents of the aperture bracket step register GRBA are subtracted from the contents of the aperture information register RGAV, and the result is stored in the register RGAy again.

Also, the contents of the shutter bracket stage number register GRBT are subtracted from the contents of the shutter bracket stage information register RGTv, and the result is stored in the register RGTv again. Here the seventh
Similar to step 56 in the figure, the same program can be used for shutter priority, aperture priority, and manual exposure modes.
This is because the contents of T have been changed. It is clear from this arithmetic expression (subtraction formula) that the second shooting will result in standard exposure, and the third shooting will result in overexposure.

[Step 129] The contents of the registers RGA v and RGTv are output from the output boats PFD and PTD, and the shutter speed information and aperture value information at this time are displayed.

The program then jumps to NEXT2, step 104. In other words, regardless of whether the second stroke switch SW2 is on or off (regardless of whether a release signal is generated or not), the first photographing starts. Furthermore, even if the shooting at this time is in the self-mode, the self-timer is not executed for the second and third times and the next shooting starts.

[Step 130] It is determined whether the off signal of the first stroke switch SW2 is input. If the off signal is not input at this time, step 128.
The display calculated in step 129 can be viewed.

In other words, the final overexposure value can be confirmed at this time. Therefore, by seeing the underexposure value of "I" once in the discrimination display in step 55, all exposure displays of the underexposure value, Je! semi-value, and overexposure I1 during auto bracketing shooting are changed in the shooting sequence. It becomes possible to check inside.The first stroke switch
When the off signal of w2 is input manually, the process advances to step 131.

[Step 1313: Reset flag FABR indicating auto bracketing mode to 0. Also output boat PF
Set the output of L to "θ" and turn off the flashing display of the auto bracket mark.

The program then returns to start and enters standby mode.

Next, a case where the auto bracket mode is not set will be described. In this case, since the flag FABR is 0, the process advances from step 126 to step 2 132.

[Step 132] Based on the on/off state of the switch 5wC5 input to PA7 (capo), it is determined whether the mode is quick shooting mode or single shooting mode. If it is quick shooting mode, return to the start, and in this case press the release button l. The first suppression operation is performed. Since the ON signal of the second stroke switch swl, 2 has been input, the next photographing begins. In the case of medium thickness mode, the process advances to step 133.

[Step 133] Wait for the off signal of the first stroke switch SW2 to be input manually.Since this is Qi photography mode, the next shooting sequence will not proceed unless the photographer stops suppressing the release button L.The off signal is input. When is input, the process returns to the start.

Next, we will discuss the case where the film ends during shooting. In this case, as mentioned above, the time measurement by the film timer, which is a one-second timer, for example, ends, so step 12
Proceed to step 150 from ζ.

[Step 150] Set the output of the output boat PC to “l”
Then, the transistor TR5 is turned on to rotate the rewind motor MC. This starts rewinding the film.

[Step 1511 Start a rewind timer used to detect whether rewinding of the film has finished.

[Step 152] It is determined whether the state of the film switch swFLM has changed. If it has changed, the process returns to step 151 and the rewind timer is started again. If there is no change, the process advances to step 153.

[Step 153] It is determined whether or not the time measurement by the rewind timer has ended. If it has not ended, the process returns to step 152.

As can be seen from the above, step 152. The process proceeds through the loop of step 153, and when the completion of feeding of one frame is detected, the process proceeds from step 152 to step 151, and this loop is repeated when the film is rewound. After that, when all the films are wound up in the cartridge, for example, the cartridge stops rotating and the state of the film switch swFLM no longer changes. If this is detected, the process proceeds to step 154.

[Step 154] Set the output of the output boat PC to “0°°
-Turns off the transistor TR5 and stops the rewind motor MC. This completes the rewinding of the film.

[Step 155] A flag FABR indicating auto bracketing mode is reset to 0. Matade Capo) PF
Set the L output to “O” and turn off the flashing auto bracket mark.

The program then returns to the start.

Also, during auto bracket shooting, in other words,
If you have to take multiple shots in a row but the film ends midway through, repeat step 1 at the 1st or 2nd frame.
In such a case, auto bracketing should not be continued on the newly loaded film, as there is a risk that the subject may be different or the photographer may misunderstand. It is desirable to notify the photographer of this and cancel the auto bracketing mode at the same time. Looking at this in the flowchart of Figure 9, when the film ends after the auto bracketing mark is displayed blinking in step 101, Automatically moves to film rewind. While this film rewind is in progress, the flashing display of the auto bracket mark has not yet been canceled. Therefore, the auto bracket mark, which would not normally be displayed, is displayed during film rewind. I am sorry that the film ended before auto bracket shooting was completed completely! The shadow person can know. In other words, this is the warning display. Also, step 155
In order to reset the flag FABR indicating auto bracketing mode to O, auto bracketing is performed on newly loaded film as in a conventional camera) ii! The inconvenience of continuing il- is also eliminated.

According to this embodiment, when the valve mode is set, the setting of the auto bracketing mode and the display indicating that the mode is set are prohibited (
In step 44 (start), bulb photography is executed in response to the press of the release button by the photographer, eliminating the risk of the photographer making an incorrect operation.

(Effects of the Invention) As described above, according to the present invention, when the valve mode is set, the valve mode priority means for prohibiting the auto bracketing mode setting by the auto bracketing mode setting means is provided. , when in valve mode,
By disabling auto-bracketing photography, meaningless auto-bracketing mode settings can be eliminated.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. Fig. 2 is a flowchart, Fig. 3 is a circuit diagram showing a microcomputer and peripheral circuits arranged in a camera incorporating the embodiment shown in Fig. 1, and Fig. 4 is a front view of the camera. , FIG. 5 is a top view, FIG. 6 is a back view, and FIGS. 7 to 9 are flow charts. l...Release button, 2.3...Operation lever, 4...Exposure mode selection knob, 5...
...Dial, 6...Switch cover, 7...
...Storage section, swABR...Auto bracket switch, swME...Multiple shooting switch,
COM・・・Microcomputer, TD, A
D, FD...decoder, 5EGI~5EG5
... Display i, DIF ... Dial interface circuit, MB, MC, MD ... Motor, 101 ... Auto bracket mode setting means, 103 ... ...Valve mode priority means, 104
...Auto bracket li! Shadow control means.

Claims (1)

[Claims] (1) an auto bracketing mode setting means for setting an auto bracketing mode; an auto bracketing shooting control means for automatically performing shooting with changing exposure values multiple times;
and bulb mode priority means for prohibiting the auto bracketing mode setting by the auto bracketing mode setting means when the bulb mode is set.